Check the articles and gear lists on the home page of this site, left-hand column. If you can get close (say within a few pounds) to the base weights (everything except food, water, fuel) in those lists, you'll be just fine. Note that the lists are for 3-season backpacking (spring, summer, fall). For really cold weather, when you need more insulation and probably a sturdier shelter, the weight will of course go up.